Fluid-pressure-releasing valve.



A. 0. CURRY..

FLUID PRESSURE RELEASING VALVE.

nrmouxon rum DEG. 27, 1913.

1 ,1 20,452. Patented Dec. 8, 1914.

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THE NORRIS PETERS ca. PHOTO-LITHOn WASHIN TON. D. C.

A. 0. CURRY.

FLUID PRESSURE RELBASING VALVE.

APPLICATION FILED EC. 27, 1913. 1 1 20,452. Patented Dec. 8, 1914 sure.y I

- In carrying ,is my purpose to provide a manually oper- U TED STATES".A-RTHURKO. Gunny; or S Nsemlm eamoama To all iuhom it may concern." I Qo Beit known that I, ARTHUR-0. CURRY, a citizen of the United States,residing at San Vented, new and useful Improvements inFluid-PressureReleasing Valves, of which the following isaspecification. This invention relates to improvements in fluid pressurerelease valves and has par- I ticular application to a bleedvalvegfonreleasing thepressure in the auxiliary reservoir and brakecylinder of an air brake system. It will be understood, however, that myimproved valve in its useful application is not limited'to thisparticular purpose, as the same may be employed wherever it is desiredto out the present invention, it

able bleed valve whereby the pressure inthe auxiliary reservoir andbrake cylinder may be released whenever necessary 1n ordertoinsure therelease of the brakesand wherein the valve will be automatically".maintained in open position during the bleeding operation.. It is alsomy purpose\ to provide a valve of the class'described which may beopened manually and which will belautomatically held open by thepressure of the fluid escaping to the atmosphere so:- that immedithevalve may close.-

.a'tely succeeding, the reduction in pressure Furthermore, I, aimto'providea valve of i the. type set forth which willfembrace the]desired features of simplicity,"eflicienc y and durability, onewhich maybe' .'installed' and maintained at a minimum expense and-one which maybe operated with-ease andconvenience. I r

- With'the above-and other objectsin view, the invention consists in theconstruction, combination and arrangement of parts hereinafter set forthin and. falling within the scope of the claims. a

In the accompanying drawings; Figure l is auviewin sideelevation'ofabrake cylinder and a portion of an auxiliary reservoir equipped with; apressure releasing valve constructed in accordance with the presentinvention; Fig. 2 is a' vertical-sectional view through the valveshowing the parts on an enlargedscale. Fi-giB is a horizontalseetionalview on the line 33 .of

' Specification of Letters Patent. 'PatQh te d Dc, Application filedDecember 27, 1913. Serial No. 809,055,}

of one .of{-the testing Bernardino, in the county of ;San ;Ber- :nardinoandbtate, of California, have inrelease a fluid under pres-FLUID-P'BESSURE-RELEASING VALVE. a

- Fig. 2 Fig. 4 is aperspectiveview of the lever support. I Fig. sis aperspective view valves." 1 Referring now to the drawings in detail,

A. des gnates an auxiliary reservoir,- BQa brake cylinder communicatingwith the res-,-. ervolr and C the piston rod connected with i the pistonworking in the brake cylinder.

. These parts maybe of any desired orv conventional type and, in thepresent instance, theauxillary reservoir is'connected directly to thebrake cylinder.v

My improved releasevalve is designated 1 as an entlrety by the letter Dand, in the present instance, comprises a metallic casing 1 equippedinteriorly, adjacent tothe upper end thereof, with a valve seat 2.Formed .1n the casing .1 at diametrically opposlte points are verticalpassages 3, 3

eachhaving the upper end thereof, communicating with the interior of thecasing above the valve seat .2 and'the lower end thereofv opening intothe atmosphere through v the side wall of the casing as at 4c. ,;Formedin each passagev 3 adjacent to the lower end thereof is a valve seat 5,while formed, in

the casing coaxial with each passage isg-a bore ,6 opening onto thelowerend of the casing. Slidably mounted-within each bore and equippedadjacent to its inner end with I a valve .disk'8 designed to engage theresp'ective seat 5 is a stem 7. In;thepresent instance, boresa9 areformed in the casing "contiguous to theupper. ends "of the passages 3,3- and mounted within the-bores and passages are coiled expansionsprings I such springs acting to maintain the valve opening-into thevalve seat 2' and the lower ,endsropening into the casingadjacent to 10'having the lower ends thereof engaging 1. the valve disks 8 and theupper ends seat- -ing. against-plugs 11 closing the bores .9,

the bottom thereof, while; formed in the .1

a casing atia point, above. the lower endsofthe passages 12 is anexhaust aperture 13. Engaging the valve seat 2 is a; valve disk 14provided with a stem 15 extending above and below the seat, whilethreaded into the; upper end of the casing is av nipple 16 and,interposed between the lower end of the nipple and the upper face ofthe valveisaa' coiled expansion spring 17 acting upon the valve to holdthe latter normally in en-- a desired. Shouldthe brakesfail tofrele'ase'for any reason, the lever 24 is' rocked and gagemeiit with it s 'seat.'withinth lower portion of thecasing 1 and capable of sliding movementthereinis 'a" disk '18 adapted toengagezthe lower end of the valve stem15 and normally held spaced" a art from-such end of the stembymeans 0t"an'ex'pansion spring 19 interposed between theunder surface of thevalve seat 2 and the upper surface of the disk 18.

Threaded into the lower end of the casing 1 is a' bj'lo'ck 21' formedcentrally with "an aperture 22 through which "the stem 20 passes, whileformed on the lower face oi the block 21 and depending therefrom are'ears 23, 23 spac'eda'part andwdisposed at opposite sides of the stem20, the lower endsof the stems 7 bein disposedfat the opposite endsof'the space between'the' ears.

-.with anysuitable wellknown manually 0on trolled operating mechanism.

' 'In practice, the valve D is supported upon a suitable bracket 28carried by the brake cylinder B and the nipple 16 'is connected I- up'with the auxiliary reservoir A by "means of a pipe 29, or the nipple 16may 'be threaded into the auxiliary reservoir A as in theinitial rockingmovement thereof the disk 18 is moved inwardly offthe [easing againstthe action of the spring 19 andjinto engagement with the lowerfend ofthe valve stem the stem 201011 the disk 18; In'the' continued rockingmovement ofthe 'lever24, the/disk 1'8" and valve stem' 15 are carriedinwardly thereby inovi-ng'the valve'disk 14 out o'f'engagement with theseat- 2 against the action.

of the spring The air now passes through thepipe 29, valve seat "2 andinto the atmosphere'by way of ports 30 formed inthe si'de-w alls of thecasing' -iminediately below the valve seat. ,KSimultaneously with thedischarge of the air into the atmosphere a portion of such air passesthrough the passages 12 and beneathtthedisk '18 thereby maintaining thelatter elevated against the action v or the springs 1 17- :Qand 19' and"the of a greater area than the 'i'ralvedisk l li As the air entersthespace below the (1181(18 "same as the diameter ofieachbf the pars air isbyway of theplurality*ofpassages 12, such 1 phere gradually dischargedintothe atm'o's- Y "but as the "diameter 'offthe latterfli's "the sagesl2ffand as" there is "a plurality of pas- "sages 12 it *will'be' seenthat theproperpres- 15,'inoident-to the lever :24 engaging "way of theexhaust aperture 13,"

lowersidefof the disk 18. Succeeding the fexhau stingnf the air from'theauxiliary reservoir andthe brake cylinder, the pressure on heundersideof the disk 18 is relieved therebypermitting the latter to gravitatetolowered position andthe valve disk 14:.

to"engage' ':the"seat 2. On the other hand, when it is desired to testthe auxiliary reservoir the lever 24 is swung in one'directi'o'n 'or theother and engages the lower end "of; one ,io'f the-stems 7 therebysliding the'lat- "ter-withi n the bore 6-to disengage thevalve 8"f-rom*- the:::seat 5 whereby the air flows I from-the" auxiliaryreservoir through-the pipe 29, the upperfportion ofthe casing 1 and thepassage :3'finto the "atmosphere at 4:.

liiromthe foregoing description taken in connect ion with theaccompanying draw ings, the constru'ction, mode of operation andmanner-' of employing iny improved pressure-r leas'ing valve will bereadily ap parent- 1 Itnwill" be seen that I have provid,ed avalve whichis especially useful in I bleeding the auxiliary reservoirs andbrakecylinders of air brake systems and wherein the valves will beautomatically held open by the pressure of the air from the cylinderand" "reservoir: Furthermore,-itwill be 'notedlthat'the pressure withinthe auxiliary reservoir; may be tested at'any time. s f hile I havehereinshown' and described onepreferredFformzof. iny invention by way ofillustration, wish" it to be understood; tha'tI idonot limit orconfine"myself to the v precise s idetails of (construction herein describedvanddelineated, as modification "and variation may be; made within the scopeof "the claims without 'dep arting from the spirit of; the invention. 9

Iclaim:" i x 151. The 'oombination with a'source of fluidiunderipressure, of a. valve "for releasing the same, fluid operatedmeans for maintaining "said "valve zin open position, an auxiliary valveasisoeiate'd with said first valve wherexhy the pressure'of the fluidmay be "tested, and vmanuallyrbperable 'means for operating said valves.i i

2; Thecom'bination with a source offluid under pressure, of a valve forreleasing the same; fiuid pperated means for maintaining "said valve' inopen position, an auxiliary valve'associated with said first valve wherepressure on the upper s'i'de'of "the valve dislr 14, 'the'lower surfaceof-th'e disk- 18 being" bythe-pressure of the. fluid may be tested, andmanually operable-means common to both valve's for operating the same.

3. In an brake mechanism, thecombina- 'tion with an'auxiliaryvreservoir,of a bleed L valve therefor, manually operable means for openingsaidvalve,'means operable from the pre'ssure of the fluid in saidreservoir to maintain said valve in open position sucis a" at "timesmaintained "upon at first valve whereby the pressure in said res--ervoir may be tested.

4. The combination with a source of'fluid under pressure, of a valve forrelieving the same comprising a casing having a valve seat formedtherein approximately centrally thereof, passages each communicating atone end with the valve seat and opening into the casing below the seat,exhaust ,ports, a valve normally engaging said seat, a stem on saidvalve, a disk slidably mounted within the casing below the valve seat,means for slidingsaid disk into engagement with said stem to open thevalve and uncover the lower ends of said passages whereby the fluidunder pressure will be released and the disk held elevated to maintainthe valve open, and a spring acting upon said disk to restore the sameto normal position succeeding the reduction of the pressure of the 5.The combination with a source of fluid under pressure, of a valve forrelieving the same comprising a casing having a valve seat formedtherein approximately centrally thereof, passages each communicating atone end with the valve seat and opening into the casing below the seat,exhaust ports, avalve normally engaging said seat, a stem on said valve,adisk slidably mounted within the r Witnesses:

casing below the valve seat, means forsliding said disk into engagementwith said stem to open the )valve and uncover the lower ends of saidpassages whereby theunder pressure, of a valve for'releasing the I same,means for maintaining said valve in open posltlo'n, an auxiliary valveassociated with said first valve whereby the pressureof the fluid may betested, and means for operating said. valves.

7. The combination with a source of fluid under pressure, of a valve forreleasing the same, means for maintaining said valve in open position,an auxiliary valve associated with said first. valve whereby thepressure of the fluid may be tested, and manually operable means foroperating said valves.

In testimony whereof I aflix my signature in'presence of two witnesses.

' ARTHUR OgGURRY.

, J. C.'AMOS,

. M. T. AMos.

copiel 01 this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. 0." I

